﻿using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp2
{
    class Class3
    {
        class round
        {
            public int Sum(int i, int j)
            {
                return i * j;
            }
            public double Sun(double a)
            {
                return 3.14 * (a * a);
            }

        }
    }
}
